61666562 has 4 divisors (see below), whose sum is σ = 92499846. Its totient is φ = 30833280.

The previous prime is 61666559. The next prime is 61666573. The reversal of 61666562 is 26566616.

61666562 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61293241 + 373321 = 7829^2 + 611^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15416639 + ... + 15416642.

Almost surely, 2^61666562 is an apocalyptic number.

61666562 is a deficient number, since it is larger than the sum of its proper divisors (30833284).

61666562 is a wasteful number, since it uses less digits than its factorization.

61666562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30833283.

The product of its digits is 77760, while the sum is 38.

The square root of 61666562 is about 7852.8059953115. The cubic root of 61666562 is about 395.0783629178.

The spelling of 61666562 in words is "sixty-one million, six hundred sixty-six thousand, five hundred sixty-two".